/Engine/Source/Runtime/RHI/Public/RHICommandList.h
void DrawIndexedIndirect ( [FRHIBuffer](API\Runtime\RHI\FRHIBuffer) * IndexBufferRHI, [FRHIBuffer](API\Runtime\RHI\FRHIBuffer) * ArgumentsBufferRHI, uint32 DrawArgumentsIndex, uint32 NumInstances )